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Hassan
1.A polar vector is one which?
A. Gives the position of an object
B. Tells how much and in which direction an object has changed its position
C. Represents rotational effect
D. Gives the position of an object
2.Which of the following acts in accordance with right hand screw rule?
A. Polar vector
B. Axial vector
C. Displacement vector
D. Polar vector
3.What is the magnitude of a unit vector?
A. It has no magnitude
B. Zero
C. Constant but not zero
D. It has no magnitude
4.Which of the following has zero magnitude?
A. Fixed vector
B. Zero vector
C. Modulus of a vector
D. Fixed vector
5.Flying a bird is an example of
A. Collinear vector
B. Multiplication of vector
C. Addition of vector
D. Collinear vector
6.Two forces whose magnitudes are in ratio of 3:5 give a resultant of 35N. If the angle of inclination is 60°, calculate the magnitude of each force.
A. 15N and35N
B. 15N and 25N
C. 10N and 15N
D. 15N and35N
7.Walking off a man is an example of?
A. Resolution of forces
B. Addition of vectors
C. Subtraction of vectors
D. Resolution of forces
8.For motion in two or three dimensions, what is the angle between velocity and acceleration vectors?
A. 0°
B. 180°
C. Between 0° and 180°
D. 0°
9.A cyclist moves along a circular path of radius 70m. If he completes one round in 11s, calculate the total length of a path.
A. 40m
B. 440m
C. 0m
D. 40m
10.An object thrown from an aeroplane is an example for?
A. Projectile motion
B. Resolution of forces
C. Composition of vectors
D. Projectile motion
11. A ball is dropped downward from the roof of a building and simultaneously another ball is thrown in a horizontal direction, when will the balls reach the ground?
A. Same time and same place
B. The first ball will reach later than the second ball
C. The second ball will reach later than the second ball
D. Same time and same place
12.. A body is projected horizontally from the top of a cliff with a velocity of 9.8m/s. What time elapses before horizontal and vertical velocities become equal? Take g = 9.8m/s2?
A. 9.8s
B. 0s
C. 10s
D. 9.8s
13.Motion of the tip of second hand of the clock is an example for?
A. Uniform circular motion
B. Projectile motion
C. Motion in a plane with uniform velocity
D. Uniform circular motion
14.M0 L0 T(-1) is an example for?
A. Angular displacement
B. Angular velocity
C. Frequency
D. Angular displacement
15.Calculate the angular speed of flywheel making 420 revolutions per minute.
A. 42300 rad/sec
B. 1200 rad/sec
C. 10/4200 rad/sec
D. 42300 rad/sec
16.Find the magnitude of the centripetal acceleration of a particle on the tip of a fan blade, 0.30 metre in diameter, rotation at 1200 rev/minute?
A. 40 m/s2
B. 4737.6 m/s2
C. 245 m/s2
D. 40 m/s2
17.What is the minimum number of coplanar vectors of different magnitudes which can give zero resultant?
A. One
B. Two
C. Three
D. One
18.The net acceleration of a particle in circular motion is?
A. Towards the centre
B. Always along the radius
C. Irregular
D. Towards the centre
19.A projectile fired from the ground follows a parabolic path. At what position will the speed of projectile be minimum?
A. At the top of the path
B. At the beginning of the path
C. While travelling along the path
D. At the top of the path
20.Two bullets are fired simultaneously, horizontally and with different speeds from the same place. Which bullet will hit the ground first?
A. The faster one
B. Depends on their mass
C. The slower one
D. The faster one
21.Three particles A,B and C are projected from the same point with the same initial speed making angles 30°,45° and 60° respectively with the horizontal. Which of the following statements is correct?
A. A, B and C have unequal ranges
B. Ranges of A and C are equal and less than that of B
C. Ranges of A and C are equal and greater than that of B
D. A, B and C have unequal ranges
22.A body executing uniform circular motion has at any instant is velocity vector and acceleration vector?
A. Along the same direction
B. In opposite direction
C. Normal to each other
D. Along the same direction
23.Two vectors have a resultant equal to either. The angle between them is?
A. 60°
B. 120°
C. 90°
D. 60°
24.A body A is dropped from vertically from the top of a tower. If another identical body is thrown horizontally from the same point at the same instant, then?
A. A will reach the ground earlier
B. B will reach the ground earlier than A
C. Both A and B will reach the ground simultaneously
D. A will reach the ground earlier
25.Which of the following is constant in projectile motion?
A. Horizontal component
B. Vertical component
C. Velocity of projection
D. Horizontal component
26.At the highest point of a projectile, its velocity and acceleration are at an angle of?
A. 0°
B. 45°
C. 90°
D. 0°
27.An aeroplane flying horizontally with a speed of 360km/h releases a bomb at a height of 490m from the ground. If g=9.8m/s2 , it will strike the ground at ?
A. 10km
B. 100km
C. 1km
D. 10km
28.A stone tied to the end of string 80cm long is whirled in horizontal circle with a constant speed. If the stone makes 14 revolutions in 25 sec, what is the magnitude of acceleration of the stone?
A. 680 cm/s2
B. 860 cm/s2
C. 720 cm/s2
D. 680 cm/s2
29.When a body falls freely under gravity, then the work done by the gravity is?
A. Positive
B. Negative
C. Zero
D. Positive
30.When a body slides against a rough horizontal surface, the work done by friction is?
A. Positive
B. Zero
C. Negative
D. Positive
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